Not true; I don't have Android and I don't need it.
Now before you go and jump to point that libhybris uses android drivers, that is completely different thing; drivers are drivers and contain nothing related to the android runtime system.
Yo wot? I have not seen anything promoted like that, can you be more specific?
I cannot comment on that since I don't need to use android on anything. There are plenty of people who think that one should run some specific OS or environment to accomplish what they want to do; In my opinion this is pretty uninformed behaviour.
I don't know about f-droid which probably makes me a non-power-user, then It is true that most of the high-end mobile hardware comes preinstalled with android but this is pretty much like most high-end computers come preinstalled with Windows or MacOS... it doesn't mean one has to keep the OS the device comes with